Senior Backend Engineer (C /. NET - Payment Reconciliation) - DC23

YOUR NEW ROLE

This role is for CODE LEAP's client company - JTL-Software

JTL-Software is one of Germany's leading providers of e-commerce and ERP solutions. More than 50,000 retailers rely on JTL every day to run their business. Our global development center in Vietnam is looking for talented people to build the next generation of these products. You'll work in an international team that pairs German software quality and Vietnamese speed to innovate.

About The Role

Payment Reconciliation is the process of matching every incoming and outgoing payment against what our systems expect - invoices, refunds, chargebacks, and the settlement files we receive from banks and payment providers. Manually, it doesn't scale. Automated, it runs quietly in the background, flags only the cases that need a human decision, and gives Finance an auditable view of every euro. That's what this team will build, from scratch.

As a Senior Software Engineer (back-end), you will

• build the services behind our reconciliation engine: ingesting and normalising provider files, matching at scale, handling exceptions
• own correctness: idempotent processing, traceable matches, safe reprocessing of historical data
• integrate new banks and payment providers and keep those integrations maintainable
• translate accounting rules into testable software, together with Product and Finance
• shape the architecture of a greenfield system and set the engineering standard for it
  
  

Team

The team will be newly established. You will work with a Senior Software Engineer (back-end) and an Engineering Manager in our Ho Chi Minh City office, collaborating closely with engineering teams in Germany and Vietnam and with the Product Managers in Germany. As one of the first engineers, you'll influence both the technical foundations and how the team works across two locations.

Your Responsibilities

• You design and build the services behind our payment reconciliation engine – ingesting settlement and payout files from banks and payment providers, normalising them, and matching them against our own transaction data
• You implement the matching logic and the exception handling around it: what matches automatically, what lands in a review queue, and how a human resolves it
• You own correctness in a domain where it is not negotiable – idempotent processing, traceable matches, and safe reprocessing of historical data without corrupting what has already been reconciled
• You integrate new banks and payment service providers, and keep those integrations maintainable as formats and requirements change
• You translate accounting and finance rules into software that is readable and testable, working directly with Product and our Finance stakeholders
• You make the architectural decisions for a greenfield system – module boundaries, data model, and how reconciliation fits into our wider platform
• You keep the system observable and operable: clear logs, meaningful metrics, and a clean answer to why did this transaction not match
• You review code, share context with the front-end engineer on the team, and help set the engineering standard for a team that is just starting out
  
  

What You Need To Bring With You

• Several years of professional experience in backend development with C# and .NET
• Deep understanding of application architecture – modular monoliths, bounded contexts, and where to draw the line between them
• Hands-on experience with CQRS and the REPR / vertical-slice style: one class per use case instead of growing service classes
• Experience with the repository pattern and with NoSQL or document databases (e.g. Azure Cosmos DB)
• Familiarity with modern API frameworks (e.g. FastEndpoints, Minimal APIs) and object mapping (e.g. Mapster, AutoMapper)
• A strong grasp of dependency injection and how to keep composition roots thin
• Solid testing practice – unit and integration tests, and an eye for what makes code testable in the first place
• Confident with Git and collaborative workflows: pull requests, code reviews, and giving feedback that lands
  
  

A BIG PLUS

• Experience with CI/CD pipelines (GitHub Actions) and basic knowledge of Kubernetes and Helm
  
  

Benefits

• Competitive salary and benefits
• Year-end bonus (13th-month salary)
• Generous annual leave of up to 18 days
• Additional premium health insurance
• Enjoy an endless selection of delicious refreshments, including gourmet coffee, beverages, snacks, and fresh fruits, all complimentary
• 1-on-1 coaching with experienced professionals
• Flexible work policy, which provides flexible hours to accommodate personal schedules and commitments
• Dynamic, fun, and agile environment, perfect for sharing and creativity
• Open-minded, kind & humble colleagues
  
  

CONTACT

Come to talk to us at [Confidential Information]

About Us

With our expert teams spread across two continents, CODE LEAP provides innovative software solutions for venture-backed companies and leading enterprise businesses in Germany. Our teams in Berlin (Germany) and Ho Chi Minh City (Vietnam) work hand in hand to develop state-of-the-art solutions of the highest quality.

Because collaborating with the right people is the secret to our successful growth.

We future-proof organizations - be part of it!